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| Subject: | Re: [gislist] SUM: Contours for Saskatchewan |
| Date: |
07/08/2005 10:20:01 AM |
| From: |
Joe Piwowar |
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Rick:
Shhh! All us Saskatchewanians are enjoying a quiet summer sleeping. :-)
I have a solution for you -- it is rather tedious, but it will work.
You can download 1:50,000 (or 1:250,000) DEMs from http://geobase.ca. The
1:50,000 data have a 0.75" lat/lon grid spacing -- about 25 m horizontal
resolution -- and 1 m vertical resolution (at 10 m accuracy). You will
need to tile them all together to create a continuous surface for the whole
province and then extract the contours from that.
A student of mine did that a while ago - it took her a couple of weeks ...
you can do it in ArcGIS with Spatial Analyst, but because you are dealing
with a whack of raster data, the process works much better using an image
analysis system like ENVI or Geomatica.
I hope this helps ...
Now, where was I? Oh yes, now I remember
.... zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz..........
Joe
>Original Question:
>
>I have been searching in vain for a contour maps of Saskatchewan (Alberta
>and Manitoba would be useful, too). I prefer shapefile format, if
>available, or at least something I can open in ArcView or to bring in as a
>base map in Surfer.
>
>I am interested in a "quick view" of elevation to compare to weather radar
>imagery I have so that I can determine which "high rainfall" events are
>likely noise from high hills and which are apt to be real values.
>
>
>SUM:
>
>Thanks for the links, all.
>
>Jamie Whitters suggested http://www.isc.ca/ but at $300 a topo sheet it is an
>impossible dream. Saskatchewan is a REAL big province and the cost to
>cover even
>the area of interest would be phenomenal and prohibitive.
>
>Torrey Sheafe suggested http://geogratis.cgdi.gc.ca/framework/framew_e.html
>but when I try to access the Saskatchewan data, I get the error "Page not
>found"
>
>Torrey also suggested http://www.geographynetwork.ca/ and this looked very
>promising, but when I requested 'Downloadable Data', 'Elevation and Derived
>Prods', and 'Saskatchewan' from the options, I got "No Records Found". Other
>combinations were equally unsuccessful.
>
>Finally, Roger Gauvin told me there are no contours in Saskatchewan and passed
>me the Sask tourism link. He signed his email "A flatlander". I've been to
>Saskatchewan. There ARE hills. And they are wreaking havoc with my weather
>radar
>imagery (they don't call them the Cypress Hills for nothing! And the area
>south
>of Saskatoon is quite hilly).
>
>Can anyone else offer some help? Any Saskatchewanians out there with a spare
>contour layer on their computer they could share?
>
>Thanks
>
>Rick
>
>Rick Gray
>GIS Specialist, Ontario Weather Network
>http://www.ownweb.ca
>GIS Instructor
>Ridgetown College, University of Guelph
>http://www.ridgetowncollege.com/
>
>Tel. 519-674-1554
>E-mail: rgray@ridgetownc.uoguelph.ca
>
>Ridgetown: -81.883 W, 42.450 N
>
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>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joseph M. Piwowar, Ph.D.
Associate Professor
Co-Director, TERRA Lab
Department of Geography
University of Regina
Regina, SK S4S 0A2
Canada
joe.piwowar@uregina.ca
http://uregina.ca/piwowarj
tel: +1.306.585.5273
fax: +1.306.585.4815
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